US20060095176A1 - Vehicle speed sensor failure detection apparatus and method for an electronic control system - Google Patents
Vehicle speed sensor failure detection apparatus and method for an electronic control systemDownload PDFInfo
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- US20060095176A1 US20060095176A1US10/980,803US98080304AUS2006095176A1US 20060095176 A1US20060095176 A1US 20060095176A1US 98080304 AUS98080304 AUS 98080304AUS 2006095176 A1US2006095176 A1US 2006095176A1
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C5/00—Registering or indicating the working of vehicles
- G07C5/08—Registering or indicating performance data other than driving, working, idle, or waiting time, with or without registering driving, working, idle or waiting time
- G07C5/0841—Registering performance data
- G07C5/085—Registering performance data using electronic data carriers
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B9/00—Safety arrangements
- G05B9/02—Safety arrangements electric
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- the present inventionrelates to an electronic control system for a vehicle; and more particularly, a vehicle speed sensor failure detection apparatus and method for the electronic control system, which is capable of avoiding mis-control of the electronic control system caused by a failure of a vehicle speed sensor.
- an electronic control system for a vehiclereceives information from a variety of sensors, processes the received information, and drives a corresponding circuit and/or an actuator in such a way that appropriate control operations can be performed.
- electronic control systemsfor example, an electronically-controlled suspension system, an electronically-controlled steering system, an ABS (anti-lock brake system), a TCS (traction control system), an ESP (electronic stability program), etc.
- the vehicle speed informationsince a device for determining a vehicle running state or a road surface condition or a device for calculating gain which determines control amount in response to a vehicle speed generates output data using vehicle speed information, the vehicle speed information must have high accuracy. Therefore, it is necessary to determine the presence or absence of a failure of the vehicle speed sensor for providing the vehicle speed information.
- the electronic control systemdetermines the presence or absence of the vehicle speed sensor failure on the basis of the information received from a plurality of sensors installed in the vehicle. More specifically, a conventional vehicle speed sensor failure detection apparatus of the electronic control system determines the presence or absence of the vehicle speed sensor failure on the basis of information received from a throttle position sensor, a brake sensor, a vehicle speed sensor and a gear position sensor.
- the conventional vehicle speed sensor detection apparatusdetermines the presence (or occurrence) of the vehicle speed sensor failure. Then, in order to avoid a danger resulting from the mis-control caused by the incorrect vehicle speed information, the conventional vehicle speed sensor failure detection apparatus stops the control operation of the electronic control system and informs a user of the control system failure occurrence.
- the gear position sensor for providing gear position informationmay not be installed in some vehicles or systems. In this case, since the electronic control system determines the presence or absence of the vehicle speed sensor failure without using the gear position information, determining the presence or absence of the vehicle speed sensor failure is not correct which also leads to the mis-control in the control operations of the electronic control system using the vehicle speed information.
- an object of the present inventionto provide a vehicle speed sensor failure detection apparatus and method for an electronic control system, which is capable of determining the presence or absence of a vehicle speed sensor failure using vehicle speed information, vehicle behavior information and brake state information, and stopping a control operation of the electronic control system using the vehicle speed information if the presence of the vehicle speed sensor failure is determined, so that mis-control in the control operation of the electronic control system using the vehicle speed information can be prevented.
- a vehicle speed sensor failure detection apparatusfor an electronic control system which has a vehicle speed sensor for detecting a vehicle speed of a vehicle and generating a vehicle speed information signal indicating vehicle speed information, including: a vehicle behavior detection portion for detecting a behavior of the vehicle and generating a vehicle behavior information signal indicating vehicle behavior information; a brake sensor for determining whether a brake of the vehicle is in an ON state or an OFF state and generating a brake state information signal indicating brake state information; and a failure detection portion for storing a vehicle speed reference level and a behavior reference level and receiving the vehicle speed information signal, the vehicle behavior information signal and the brake state information signal, wherein if the vehicle speed information is less than or equal to the vehicle speed reference level, the vehicle behavior information signal generated during a predetermined period of time includes a portion exceeding the behavior reference level and the brake is in the OFF state, the failure detection portion generates a failure signal.
- a vehicle speed sensor failure detection apparatusfor an electronic control system which has a vehicle speed sensor for detecting a vehicle speed of a vehicle and generating a vehicle speed information signal indicating vehicle speed information, including: a vehicle behavior detection portion for detecting a behavior of the vehicle and generating a vehicle behavior information signal indicating vehicle behavior information; a brake sensor for determining whether a brake of the vehicle is in an ON state or an OFF state and generating a brake state information signal indicating brake state information; and a failure detection portion for storing a vehicle speed change rate reference level and a behavior reference level, receiving the vehicle speed information signal, the vehicle behavior information signal and the brake state information signal, and calculating a change rate of the vehicle speed information, wherein if the change rate of the vehicle speed information generated during a predetermined first period of time is less than or equal to the vehicle speed change rate reference level, the vehicle behavior information signal generated during a predetermined second period of time includes a portion exceeding the behavior reference level, and the brake is in the OFF
- a vehicle speed sensor failure detection method for an electronic control systemwhich stores a vehicle speed reference level and a behavior reference level, including the steps of: detecting a vehicle speed of a vehicle and generating a vehicle speed information signal indicating vehicle speed information; detecting a behavior of the vehicle and generating a vehicle behavior information signal indicating vehicle behavior information; determining whether a brake of the vehicle is in an ON state or an OFF state, and generating a brake state information signal indicating brake state information; generating a failure signal, if the vehicle speed information is less than or equal to the vehicle speed reference level, the vehicle behavior information signal generated during a predetermined period of time includes a portion exceeding the behavior reference level, and the brake is in the OFF state; and stopping a control operation of the electronic control system in response to the failure signal, the control operation of the electronic control system using the vehicle speed information.
- FIG. 1is a block diagram of a vehicle speed sensor failure detection apparatus for an electronic control system in accordance with a preferred embodiment of the present invention.
- FIG. 2presents a flow chart illustrating operation of the vehicle speed sensor failure detection apparatus of FIG. 1 .
- the vehicle speed sensor failure detection apparatus for determining a failure of a vehicle speed sensor 101includes a vehicle behavior detection portion 103 , a vehicle engine running detection portion 105 , a brake sensor 107 , a failure detection portion 110 , a control portion 120 and a display portion 130 .
- the vehicle speed sensor 101detects a vehicle speed, generates and transmits to the failure detection portion 110 a vehicle speed information signal indicating vehicle speed information.
- the vehicle engine running detection portion 105determines whether a vehicle engine is in an ON or OFF state, generates and transmits to the failure detection portion 110 an engine state information signal indicating vehicle engine state information, wherein the ON state of the vehicle engine indicates that the vehicle engine is running, and the OFF state of the vehicle engine indicates that the vehicle engine is not running.
- the vehicle behavior detection portion 103detects behavior of the vehicle by using signals detected by a vertical acceleration sensor, a horizontal acceleration sensor, a steering angle sensor, a vehicle height sensor and like, generates and transmits to the failure detection portion 110 a vehicle behavior information signal indicating vehicle behavior information.
- the brake sensor 107determines whether a vehicle brake is in an ON state or OFF state, generates and transmits to the failure detection portion 110 a brake state information signal indicating vehicle brake state information, wherein the ON state of the vehicle brake indicates that the vehicle brake generates a braking force and the OFF state of the vehicle brake indicates that the vehicle brake does not generate the braking force.
- the failure detection portion 110which receives the vehicle speed information signal, the vehicle behavior information signal, the engine state information signal and the brake state information signal, stores a vehicle speed reference level (or a first reference level) and a vehicle behavior reference level (or a second reference level) which are used to determine the presence or absence of the failure of the vehicle speed sensor 101 . Further, in case noise or DC offset must be removed from the vehicle behavior information signal of the vehicle behavior detection portion 103 , the failure detection portion 110 may further include a low pass filter or a high pass filter.
- the failure detection portion 110filters the vehicle behavior information signal of the vehicle behavior detection portion 103 . If the vehicle behavior information signal filtered during a predetermined period of time includes a portion exceeding the second reference level, the vehicle speed information (or vehicle speed) is less than or equal to the first reference level and the vehicle brake is in the OFF state, the failure detection portion 110 generates and transmits a failure signal to the control portion 120 .
- the failure detection portion 110generates and transmits the failure signal to the control portion 120 .
- the failure detection portion 110determines the presence or absence of the vehicle speed sensor failure either by using the information from the vehicle speed sensor 101 , the vehicle behavior detection portion 103 and the brake sensor 107 , or by using the information from the vehicle speed sensor 101 , the vehicle behavior detection portion 103 , the brake sensor 107 and the vehicle engine running detection portion 105 .
- the control portion 120Upon receipt of the failure signal from the failure detection portion 110 , the control portion 120 stops a control operation of the electronic control system using the vehicle speed information transmitted from the vehicle speed sensor 101 , for example, a control operation of an electronically-controlled suspension system or an electronically-controlled steering system which controls the control amount of an actuator by using the vehicle speed information.
- control portion 120includes a counter 120 a for counting the number of occurrence times of the failure signal from the failure detection portion 110 . If the number of occurrence times of the failure signal reaches a predetermined number of times, the counter 120 a generates and transmits a warning signal to the display portion 130 .
- the warning signalis displayed on the display portion 130 constituted by an LCD or LED, so that a user can be informed of the failure of the vehicle speed sensor 101 .
- the failure detection portion 110directly uses the vehicle speed information (or vehicle speed) to determine the presence or absence of the failure of the vehicle speed sensor 101 .
- the failure detection portion 110can use a change rate of the vehicle speed information (or vehicle speed) generated during a predetermined period of time. In other words, if the change rate of the vehicle speed information (or vehicle speed) is less than or equal to a predetermined level, the vehicle behavior information signal filtered during a predetermined period of time includes the portion exceeding the second reference level and the vehicle brake is in the OFF state, the failure detection portion 110 generates and transmits the failure signal to the control portion 120 .
- a vehicle speed sensor failure detection operation of the aforementioned vehicle speed sensor failure detection apparatus for use in the electronic control systemwill now be described with reference to FIG. 2 .
- the failure detection portion 110receives the vehicle speed information signal from the vehicle speed sensor 101 at step S 200 , and determines whether the received vehicle speed information (or vehicle speed) is less than or equal to the first reference level at step S 202 .
- the vehicle speed sensor failure detection operationreturns to step S 200 , so that the failure detection portion 110 receives the vehicle speed information signal from the vehicle speed sensor 101 . Meanwhile, if the received vehicle speed information (or vehicle speed) is less than or equal to the first reference level, the failure detection portion 110 determines, at step S 204 , whether or not the vehicle engine is in the ON state, i.e., the vehicle engine is running, on the basis of the engine state information from the vehicle engine running detection portion 105 .
- the vehicle speed sensor failure detection operationreturns to step S 200 , so that the failure detection portion 110 receives the vehicle speed information signal from the vehicle speed sensor 101 . Meanwhile, if the vehicle engine is determined to be in the ON state at step S 204 , the failure detection portion 110 receives and filters the vehicle behavior information signal at step S 206 , and then determines whether or not the filtered vehicle behavior information signal includes the portion exceeding the second reference level at step S 208 .
- the vehicle speed sensor failure detection operationreturns to step S 200 , so that the failure detection portion 110 receives the vehicle speed information signal from the vehicle speed sensor 101 . Meanwhile, if the filtered vehicle behavior information signal includes the portion exceeding the second reference level at step S 208 , the failure detection portion 110 determines, at step S 210 , whether or not the vehicle brake is in the OFF state on the basis of the brake state information received from the brake sensor 107 .
- the vehicle speed sensor failure detection operationreturns to step S 200 , so that the failure detection portion 110 receives the vehicle speed information signal from the vehicle speed sensor 101 . Meanwhile, if the vehicle brake is in the OFF state at step S 210 , the failure detection portion 110 determines the occurrence of the failure of the vehicle speed sensor 101 , and transmits the failure signal to the control portion 120 at step S 212 .
- control portion 120stops, at step S 214 , the control operation of the electronic control system using the vehicle speed.
- the vehicle speed sensor failure detection operationmay use the change rate of the vehicle speed information (or vehicle speed). That is, at step S 202 , the change rate of the vehicle speed information (or vehicle speed) during a predetermined period of time can be used.
- the vehicle speed sensor failure detection apparatus and method of the present inventiondetermines the presence or absence of the vehicle speed sensor failure by using information on the vehicle speed, the vehicle behavior, the brake state and the engine state, and if there is the vehicle speed sensor failure, the control operation of the electronic control system using the vehicle speed information is stopped to avoid the mis-control of the electronic control system.
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Abstract
Description
- The present invention relates to an electronic control system for a vehicle; and more particularly, a vehicle speed sensor failure detection apparatus and method for the electronic control system, which is capable of avoiding mis-control of the electronic control system caused by a failure of a vehicle speed sensor.
- In general, an electronic control system for a vehicle receives information from a variety of sensors, processes the received information, and drives a corresponding circuit and/or an actuator in such a way that appropriate control operations can be performed. There are a variety of electronic control systems, for example, an electronically-controlled suspension system, an electronically-controlled steering system, an ABS (anti-lock brake system), a TCS (traction control system), an ESP (electronic stability program), etc.
- Particularly, in the electronic control system, since a device for determining a vehicle running state or a road surface condition or a device for calculating gain which determines control amount in response to a vehicle speed generates output data using vehicle speed information, the vehicle speed information must have high accuracy. Therefore, it is necessary to determine the presence or absence of a failure of the vehicle speed sensor for providing the vehicle speed information.
- The electronic control system determines the presence or absence of the vehicle speed sensor failure on the basis of the information received from a plurality of sensors installed in the vehicle. More specifically, a conventional vehicle speed sensor failure detection apparatus of the electronic control system determines the presence or absence of the vehicle speed sensor failure on the basis of information received from a throttle position sensor, a brake sensor, a vehicle speed sensor and a gear position sensor.
- If a TPS value of the throttle position sensor is equal to or greater than a predetermined level, a brake state is in an OFF state, a gear position is in a drive position and a vehicle speed is less than a predetermined vehicle speed, the conventional vehicle speed sensor detection apparatus determines the presence (or occurrence) of the vehicle speed sensor failure. Then, in order to avoid a danger resulting from the mis-control caused by the incorrect vehicle speed information, the conventional vehicle speed sensor failure detection apparatus stops the control operation of the electronic control system and informs a user of the control system failure occurrence.
- However, some diesel vehicles or systems are not equipped with the throttle position sensor. In this case, since the electronic control system determines the presence or absence of the vehicle speed sensor failure without using information from the throttle position sensor, determining the presence or absence of the vehicle speed sensor failure is not correct which leads to the mis-control in control operations of the electronic control system using the vehicle speed information.
- Further, the gear position sensor for providing gear position information may not be installed in some vehicles or systems. In this case, since the electronic control system determines the presence or absence of the vehicle speed sensor failure without using the gear position information, determining the presence or absence of the vehicle speed sensor failure is not correct which also leads to the mis-control in the control operations of the electronic control system using the vehicle speed information.
- It is, therefore, an object of the present invention to provide a vehicle speed sensor failure detection apparatus and method for an electronic control system, which is capable of determining the presence or absence of a vehicle speed sensor failure using vehicle speed information, vehicle behavior information and brake state information, and stopping a control operation of the electronic control system using the vehicle speed information if the presence of the vehicle speed sensor failure is determined, so that mis-control in the control operation of the electronic control system using the vehicle speed information can be prevented.
- In accordance with one aspect of the invention, there is provided a vehicle speed sensor failure detection apparatus for an electronic control system which has a vehicle speed sensor for detecting a vehicle speed of a vehicle and generating a vehicle speed information signal indicating vehicle speed information, including: a vehicle behavior detection portion for detecting a behavior of the vehicle and generating a vehicle behavior information signal indicating vehicle behavior information; a brake sensor for determining whether a brake of the vehicle is in an ON state or an OFF state and generating a brake state information signal indicating brake state information; and a failure detection portion for storing a vehicle speed reference level and a behavior reference level and receiving the vehicle speed information signal, the vehicle behavior information signal and the brake state information signal, wherein if the vehicle speed information is less than or equal to the vehicle speed reference level, the vehicle behavior information signal generated during a predetermined period of time includes a portion exceeding the behavior reference level and the brake is in the OFF state, the failure detection portion generates a failure signal.
- In accordance with another aspect of the invention, there is provided a vehicle speed sensor failure detection apparatus for an electronic control system which has a vehicle speed sensor for detecting a vehicle speed of a vehicle and generating a vehicle speed information signal indicating vehicle speed information, including: a vehicle behavior detection portion for detecting a behavior of the vehicle and generating a vehicle behavior information signal indicating vehicle behavior information; a brake sensor for determining whether a brake of the vehicle is in an ON state or an OFF state and generating a brake state information signal indicating brake state information; and a failure detection portion for storing a vehicle speed change rate reference level and a behavior reference level, receiving the vehicle speed information signal, the vehicle behavior information signal and the brake state information signal, and calculating a change rate of the vehicle speed information, wherein if the change rate of the vehicle speed information generated during a predetermined first period of time is less than or equal to the vehicle speed change rate reference level, the vehicle behavior information signal generated during a predetermined second period of time includes a portion exceeding the behavior reference level, and the brake is in the OFF state, the failure detection portion generates a failure signal.
- In accordance with still another aspect of the invention, there is provided a vehicle speed sensor failure detection method for an electronic control system which stores a vehicle speed reference level and a behavior reference level, including the steps of: detecting a vehicle speed of a vehicle and generating a vehicle speed information signal indicating vehicle speed information; detecting a behavior of the vehicle and generating a vehicle behavior information signal indicating vehicle behavior information; determining whether a brake of the vehicle is in an ON state or an OFF state, and generating a brake state information signal indicating brake state information; generating a failure signal, if the vehicle speed information is less than or equal to the vehicle speed reference level, the vehicle behavior information signal generated during a predetermined period of time includes a portion exceeding the behavior reference level, and the brake is in the OFF state; and stopping a control operation of the electronic control system in response to the failure signal, the control operation of the electronic control system using the vehicle speed information.
- The above and other objects and features of the present invention will become more apparent from the following description of preferred embodiments given in conjunction with the accompanying drawings, in which:
FIG. 1 is a block diagram of a vehicle speed sensor failure detection apparatus for an electronic control system in accordance with a preferred embodiment of the present invention; andFIG. 2 presents a flow chart illustrating operation of the vehicle speed sensor failure detection apparatus ofFIG. 1 .- Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
- Referring to
FIG. 1 , there is provided a block diagram of a vehicle speed sensor failure detection apparatus for an electronic control system in accordance with a preferred embodiment of the present invention. As shown inFIG. 1 , the vehicle speed sensor failure detection apparatus for determining a failure of avehicle speed sensor 101 includes a vehiclebehavior detection portion 103, a vehicle enginerunning detection portion 105, abrake sensor 107, afailure detection portion 110, acontrol portion 120 and adisplay portion 130. - The
vehicle speed sensor 101 detects a vehicle speed, generates and transmits to the failure detection portion110 a vehicle speed information signal indicating vehicle speed information. - The vehicle engine
running detection portion 105 determines whether a vehicle engine is in an ON or OFF state, generates and transmits to thefailure detection portion 110 an engine state information signal indicating vehicle engine state information, wherein the ON state of the vehicle engine indicates that the vehicle engine is running, and the OFF state of the vehicle engine indicates that the vehicle engine is not running. - The vehicle
behavior detection portion 103 detects behavior of the vehicle by using signals detected by a vertical acceleration sensor, a horizontal acceleration sensor, a steering angle sensor, a vehicle height sensor and like, generates and transmits to the failure detection portion110 a vehicle behavior information signal indicating vehicle behavior information. - The
brake sensor 107 determines whether a vehicle brake is in an ON state or OFF state, generates and transmits to the failure detection portion110 a brake state information signal indicating vehicle brake state information, wherein the ON state of the vehicle brake indicates that the vehicle brake generates a braking force and the OFF state of the vehicle brake indicates that the vehicle brake does not generate the braking force. - The
failure detection portion 110, which receives the vehicle speed information signal, the vehicle behavior information signal, the engine state information signal and the brake state information signal, stores a vehicle speed reference level (or a first reference level) and a vehicle behavior reference level (or a second reference level) which are used to determine the presence or absence of the failure of thevehicle speed sensor 101. Further, in case noise or DC offset must be removed from the vehicle behavior information signal of the vehiclebehavior detection portion 103, thefailure detection portion 110 may further include a low pass filter or a high pass filter. - The
failure detection portion 110 filters the vehicle behavior information signal of the vehiclebehavior detection portion 103. If the vehicle behavior information signal filtered during a predetermined period of time includes a portion exceeding the second reference level, the vehicle speed information (or vehicle speed) is less than or equal to the first reference level and the vehicle brake is in the OFF state, thefailure detection portion 110 generates and transmits a failure signal to thecontrol portion 120. - Further, if the vehicle behavior information signal filtered during the predetermined period of time includes the portion exceeding the second reference level, the vehicle speed information (or vehicle speed) is less than or equal to the first reference level, the vehicle brake is in the OFF state and the vehicle engine is in the ON state, the
failure detection portion 110 generates and transmits the failure signal to thecontrol portion 120. - That is, the
failure detection portion 110 determines the presence or absence of the vehicle speed sensor failure either by using the information from thevehicle speed sensor 101, the vehiclebehavior detection portion 103 and thebrake sensor 107, or by using the information from thevehicle speed sensor 101, the vehiclebehavior detection portion 103, thebrake sensor 107 and the vehicle enginerunning detection portion 105. - Upon receipt of the failure signal from the
failure detection portion 110, thecontrol portion 120 stops a control operation of the electronic control system using the vehicle speed information transmitted from thevehicle speed sensor 101, for example, a control operation of an electronically-controlled suspension system or an electronically-controlled steering system which controls the control amount of an actuator by using the vehicle speed information. - Further, the
control portion 120 includes acounter 120a for counting the number of occurrence times of the failure signal from thefailure detection portion 110. If the number of occurrence times of the failure signal reaches a predetermined number of times, thecounter 120a generates and transmits a warning signal to thedisplay portion 130. - The warning signal is displayed on the
display portion 130 constituted by an LCD or LED, so that a user can be informed of the failure of thevehicle speed sensor 101. - As described above, the
failure detection portion 110 directly uses the vehicle speed information (or vehicle speed) to determine the presence or absence of the failure of thevehicle speed sensor 101. However, thefailure detection portion 110 can use a change rate of the vehicle speed information (or vehicle speed) generated during a predetermined period of time. In other words, if the change rate of the vehicle speed information (or vehicle speed) is less than or equal to a predetermined level, the vehicle behavior information signal filtered during a predetermined period of time includes the portion exceeding the second reference level and the vehicle brake is in the OFF state, thefailure detection portion 110 generates and transmits the failure signal to thecontrol portion 120. - A vehicle speed sensor failure detection operation of the aforementioned vehicle speed sensor failure detection apparatus for use in the electronic control system will now be described with reference to
FIG. 2 . - As shown in
FIG. 2 , thefailure detection portion 110 receives the vehicle speed information signal from thevehicle speed sensor 101 at step S200, and determines whether the received vehicle speed information (or vehicle speed) is less than or equal to the first reference level at step S202. - If the received vehicle speed information (or vehicle speed) is greater than the first reference level at step S202, the vehicle speed sensor failure detection operation returns to step S200, so that the
failure detection portion 110 receives the vehicle speed information signal from thevehicle speed sensor 101. Meanwhile, if the received vehicle speed information (or vehicle speed) is less than or equal to the first reference level, thefailure detection portion 110 determines, at step S204, whether or not the vehicle engine is in the ON state, i.e., the vehicle engine is running, on the basis of the engine state information from the vehicle enginerunning detection portion 105. - If the vehicle engine is determined to be in the OFF state at step204, the vehicle speed sensor failure detection operation returns to step S200, so that the
failure detection portion 110 receives the vehicle speed information signal from thevehicle speed sensor 101. Meanwhile, if the vehicle engine is determined to be in the ON state at step S204, thefailure detection portion 110 receives and filters the vehicle behavior information signal at step S206, and then determines whether or not the filtered vehicle behavior information signal includes the portion exceeding the second reference level at step S208. - If the filtered vehicle behavior information signal does not include the portion exceeding the second reference level at step S208, the vehicle speed sensor failure detection operation returns to step S200, so that the
failure detection portion 110 receives the vehicle speed information signal from thevehicle speed sensor 101. Meanwhile, if the filtered vehicle behavior information signal includes the portion exceeding the second reference level at step S208, thefailure detection portion 110 determines, at step S210, whether or not the vehicle brake is in the OFF state on the basis of the brake state information received from thebrake sensor 107. - If the vehicle brake is in the ON state at step S210, the vehicle speed sensor failure detection operation returns to step S200, so that the
failure detection portion 110 receives the vehicle speed information signal from thevehicle speed sensor 101. Meanwhile, if the vehicle brake is in the OFF state at step S210, thefailure detection portion 110 determines the occurrence of the failure of thevehicle speed sensor 101, and transmits the failure signal to thecontrol portion 120 at step S212. - In response to the failure signal from the
failure detection portion 110, thecontrol portion 120 stops, at step S214, the control operation of the electronic control system using the vehicle speed. - In the aforementioned preferred embodiment, although the vehicle speed sensor failure is determined by directly using the vehicle speed information (or vehicle speed), it should be noted that the vehicle speed sensor failure detection operation may use the change rate of the vehicle speed information (or vehicle speed). That is, at step S202, the change rate of the vehicle speed information (or vehicle speed) during a predetermined period of time can be used.
- As described above, the vehicle speed sensor failure detection apparatus and method of the present invention determines the presence or absence of the vehicle speed sensor failure by using information on the vehicle speed, the vehicle behavior, the brake state and the engine state, and if there is the vehicle speed sensor failure, the control operation of the electronic control system using the vehicle speed information is stopped to avoid the mis-control of the electronic control system.
- While the invention has been shown and described with respect to the preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.
Claims (10)
1. A vehicle speed sensor failure detection apparatus for an electronic control system which has a vehicle speed sensor for detecting a vehicle speed of a vehicle and generating a vehicle speed information signal indicating vehicle speed information, comprising:
a vehicle behavior detection portion for detecting a behavior of the vehicle and generating a vehicle behavior information signal indicating vehicle behavior information;
a brake sensor for determining whether a brake of the vehicle is in an ON state or an OFF state and generating a brake state information signal indicating brake state information; and
a failure detection portion for storing a vehicle speed reference level and a behavior reference level and receiving the vehicle speed information signal, the vehicle behavior information signal and the brake state information signal,
wherein if the vehicle speed information is less than or equal to the vehicle speed reference level, the vehicle behavior information signal generated during a predetermined period of time includes a portion exceeding the behavior reference level and the brake is in the OFF state, the failure detection portion generates a failure signal.
2. The apparatus ofclaim 1 , wherein the vehicle behavior detection portion generates the vehicle behavior information signal by using at least one of signals generated from a vertical acceleration sensor, a horizontal acceleration sensor, a steering angle sensor and a vehicle height sensor.
3. The apparatus ofclaim 1 , further comprising an engine running detection portion for determining whether an engine of the vehicle is in an ON state or an OFF state and generating an engine state information signal indicating engine state information,
wherein if the vehicle speed information is less than or equal to the vehicle speed reference level, the vehicle behavior information signal generated during the predetermined period of time includes the portion exceeding the behavior reference level, the brake is in the OFF state and the engine is in the ON state, the failure detection portion generates the failure signal.
4. The apparatus ofclaim 1 , further comprising a control portion for stopping a control operation of the electronic control system when the failure signal is generated, the control operation of the electronic control system using the vehicle speed information.
5. The apparatus ofclaim 4 , wherein the control portion includes a counter for counting the number of occurrence times of the failure signal, and generating a warning signal if the number of occurrence times of the failure signal is greater than a predetermined number of times.
6. The apparatus ofclaim 5 , further comprising a display portion for displaying the warning signal generated from the counter of the control portion.
7. A vehicle speed sensor failure detection apparatus for an electronic control system which has a vehicle speed sensor for detecting a vehicle speed of a vehicle and generating a vehicle speed information signal indicating vehicle speed information, comprising:
a vehicle behavior detection portion for detecting a behavior of the vehicle and generating a vehicle behavior information signal indicating vehicle behavior information;
a brake sensor for determining whether a brake of the vehicle is in an ON state or an OFF state and generating a brake state information signal indicating brake state information; and
a failure detection portion for storing a vehicle speed change rate reference level and a behavior reference level, receiving the vehicle speed information signal, the vehicle behavior information signal and the brake state information signal, and calculating a change rate of the vehicle speed information,
wherein if the change rate of the vehicle speed information generated during a predetermined first period of time is less than or equal to the vehicle speed change rate reference level, the vehicle behavior information signal generated during a predetermined second period of time includes a portion exceeding the behavior reference level, and the brake is in the OFF state, the failure detection portion generates a failure signal.
8. A vehicle speed sensor failure detection method for an electronic control system which stores a vehicle speed reference level and a behavior reference level, comprising the steps of:
detecting a vehicle speed of a vehicle and generating a vehicle speed information signal indicating vehicle speed information;
detecting a behavior of the vehicle and generating a vehicle behavior information signal indicating vehicle behavior information;
determining whether a brake of the vehicle is in an ON state or an OFF state, and generating a brake state information signal indicating brake state information;
generating a failure signal, if the vehicle speed information is less than or equal to the vehicle speed reference level, the vehicle behavior information signal generated during a predetermined period of time includes a portion exceeding the behavior reference level, and the brake is in the OFF state; and
stopping a control operation of the electronic control system in response to the failure signal, the control operation of the electronic control system using the vehicle speed information.
9. The method ofclaim 8 , wherein the vehicle behavior information signal is generated by using at least one of signals generated from a vertical acceleration sensor, a horizontal acceleration sensor, a steering angle sensor and a vehicle height sensor.
10. The method ofclaim 8 , further comprising the step of determining whether an engine of the vehicle is in an ON state or an OFF state and generating an engine state information signal indicating engine state information,
wherein if the vehicle speed information is less than or equal to the vehicle speed reference level, the vehicle behavior information signal generated during a predetermined period of time includes a portion exceeding the behavior reference level, the brake is in the OFF state and the engine is in the ON state, the failure signal is generated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/980,803US7058490B2 (en) | 2004-11-04 | 2004-11-04 | Vehicle speed sensor failure detection apparatus and method for an electronic control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/980,803US7058490B2 (en) | 2004-11-04 | 2004-11-04 | Vehicle speed sensor failure detection apparatus and method for an electronic control system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| US20060095176A1true US20060095176A1 (en) | 2006-05-04 |
| US7058490B2 US7058490B2 (en) | 2006-06-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| US10/980,803Expired - LifetimeUS7058490B2 (en) | 2004-11-04 | 2004-11-04 | Vehicle speed sensor failure detection apparatus and method for an electronic control system |
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| US20090222162A1 (en)* | 2008-02-29 | 2009-09-03 | Caterpillar Inc. | System and method for indirectly detecting machine movement |
| CN114583659A (en)* | 2020-12-02 | 2022-06-03 | 蔚然（南京）动力科技有限公司 | Control method, control device and system for permanent magnet synchronous motor system |
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| CN114583659A (en)* | 2020-12-02 | 2022-06-03 | 蔚然（南京）动力科技有限公司 | Control method, control device and system for permanent magnet synchronous motor system |
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